[PR PATCH] common/environment/setup/sourcepkg.sh: preserve RUST_TARGET variable

[tranzystorek-io <tranzystorek-io@users.noreply.github.com>]

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There is a new pull request by tranzystorek-io against master on the void-packages repository

https://github.com/tranzystorek-io/void-packages rust-target
https://github.com/void-linux/void-packages/pull/42093

common/environment/setup/sourcepkg.sh: preserve RUST_TARGET variable
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Found when preparing an update for Rust

#### Testing the changes
- I tested the changes in this PR: **YES**

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A patch file from https://github.com/void-linux/void-packages/pull/42093.patch is attached

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From a492b89ee98a5c30f79f8850735675b58de0e90e Mon Sep 17 00:00:00 2001
From: Marcin Puc <tranzystorek.io@protonmail.com>
Date: Sun, 5 Feb 2023 13:50:33 +0100
Subject: [PATCH] common/environment/setup/sourcepkg.sh: preserve RUST_TARGET
 variable

---
 common/environment/setup/sourcepkg.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/environment/setup/sourcepkg.sh b/common/environment/setup/sourcepkg.sh
index 4e3b4e98ba43..9d8b7f419f58 100644
--- a/common/environment/setup/sourcepkg.sh
+++ b/common/environment/setup/sourcepkg.sh
@@ -5,7 +5,7 @@
 for var in $(awk 'BEGIN{for (i in ENVIRON) {print i}}' </dev/null); do
 	# Those variables in chroot.sh will be kept
 	case "$var" in
-	XBPS_* | IN_CHROOT | CHROOT_READY | SOURCE_DATE_EPOCH)
+	XBPS_* | IN_CHROOT | CHROOT_READY | SOURCE_DATE_EPOCH | RUST_TARGET)
 		# xbps-src specific
 		;;
 	SOURCEFORGE_SITE | NONGNU_SITE | XORG_SITE | DEBIAN_SITE | GNOME_SITE)